Murray 405021x51A, Operator'S Manual

Page: 16 / 168

16
Maintenance en
General Recommendations
1. The owner’s responsibility is to maintain this
product. This will extend the life of the product
and is also necessary to maintain warranty
coverage.
2. Check the spark plug, drive brake, lubricate the
unit, and clean the air filter once a year.
3. Check the fasteners. Make sure all fasteners are
tight.
4. Follow the Maintenance section to keep the unit in
good operating condition.
WARNING
Before you make an inspection, adjustment, or
repair to the unit, disconnect the wire to the spark
plug. Remove the wire from the spark plug to
prevent the engine from starting by accident.
NOTE: Torque is measured in foot pounds (metric Nm).
This measurement describes how tight a nut or bolt
must be.The torque is measured with a torque wrench.
Inspect the Blade
WARNING
Before you inspect or remove the blade, disconnect
the wire to the spark plug. If the blade hits an
object, stop the engine. Check the unit for damage.
The blade has sharp edges.When you hold the
blade, use gloves or cloth material to protect your
hands.
If you keep the blade (1) sharp and inspect the blade
for damage, the blade will cut better and be more safe
to operate (see F
Figure 7). Frequently check the blade
for excessive wear, cracks,or other damage.
Frequently check the nut (3) that holds the blade (1).
Keep the nut (3) tight. If the blade hits an object, stop
the engine. Disconnect the wire to the spark plug. See
if the blade is bent or damaged. Check the blade
adapter (5) for damage.
Before you operate the unit, replace damaged parts
with original equipment parts. See the authorized serv-
ice center in your area. Every three years, have an au-
thorized service person inspect the blade or replace
the old blade with an original equipment part.
Remove and Install the Blade
1. Remove the mower housing. See the instructions
to “Remove the Mower Housing.”
2. Use a piece of wood to keep the blade from
rotating.
3. Remove the nut (3) that holds the blade (1) (see
Figure 7).
4. Check the blade and the blade adapter (5)
according to the instructions for “Inspect Blade.”
Replace a badly worn or damaged blade with an
original equipment blade. See an authorized
service center in your area.
5. Clean the top and bottom of the mower housing.
Remove all the grass and debris.
6. Mount the blade and blade adapter (5) on the
mandrel (6).
7. Mount the blade so that the hi-lift edges (7) are
up. If the blade is upside down, the blade will not
cut correctly and can cause an accident.
8. Fasten the blade with the original washers and
nut (3). Make sure the outside rim of the Belleville
washer (2) is against the blade.
WARNING
Always keep the nut (3) tight that holds the blade
(1). A loose nut or blade can cause an accident.
9. Tighten the nut (3) that holds the blade to a
torque of 30 foot pounds (41,5 Nm).
10. Install the mower housing. See “Remove the
Mower Housing.”
6
5
4
3
2
7
1
Figure 7